Dimension suddenly unusable due to auto-pan bug

Hi,

In addition to the other bug which randomly appeared for me in Dimension a while back, which I still can't get an answer about from anyone: Re: Imported Background Image is Pixelated - Adobe Support Community - 13416647

I now have an issue which has literally just appeared since yesterday for no apparent reason:

I open my project, I move my mouse into the workspace area (the canvas and the area surrounding the canvas), the canvas view of the scene automatically scrolls outwards. It just zooms out. Every single time. It doesn't stop unless I move my mouse back out into one of the toolbar areas. The scene I've created progressively getting further away within the canvas. Continually.

So essentially I now cannot use the programme, because there is no possible way to compose a scene when the view of the scene is constantly moving further and further away.

I am not having any issues with scrolling or with my mouse in any other programme. It's clearly a problem in Dimension as it only specifically happens in one area of the interface.

Please, somebody, tell me this is easily fixed and I've just accidentally put on a stupid setting somewhere that I need to change, because if not I now essentially cannot do my job.

Thanks!